<template>
  <view>
    <!-- 搜索框 -->
    <view class="search-box">
      <!-- 基本用法 -->
      <uni-search-bar @input="input" :radius="100" cancelButton="none" bgColor="#fff" focus="true" ></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" >
      <view class="sugg-item" @click="gotoDetail(item.goods_id)" v-for="(item, i) in searchResults" :key="i" >
        <view class="goods-name">{{item.goods_name}}</view>
         <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 历史搜索记录 -->
    <view class="history-box" v-show="!kw">
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:'null',
        kw:'',
        searchResults:[],
        //历史信息
        historyList:['蝴蝶结','衬衫','拼接']
      };
    },
    onLoad(){
      this.historyList=JSON.parse(uni.getStorageSync('kw')||'[]')
    },
    methods:{
      input1(e){
        this.kw=e
      },
      //触发input输入事件
      input(e){
        //当输入时一直清除timer的定时器
        clearTimeout(this.timer)
      this.timer= setTimeout(()=>{
        this.kw=e
        this.getSearchResult()
         // console.log(e);
       },500)
      },
     async getSearchResult(){
        // 判断关键词是否为空
         if (this.kw === '') {
           //当为空的时候不发起数据请求
           this.searchResults = []
           return
         }
       
       const { data: res } = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
     if (res.meta.status !== 200) return uni.$showMsg()
     this.searchResults=res.message
     console.log(res.message);
     
     //问题：但键盘按下enter键再存储数据？？？？？
     this.saveSearchHistory()
     // console.log(111);
      },
      gotoDetail(goods_id){
        // console.log(item.goods_id);
        // 地址跳转
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id='+goods_id
        })
      },
      saveSearchHistory(){
        // this.historyList.push(this.kw)
         // 1. 将 Array 数组转化为 Set 对象
          const set = new Set(this.historyList)
          // 2. 调用 Set 对象的 delete 方法，移除对应的元素
          set.delete(this.kw)
          // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
          set.add(this.kw)
          // 4. 将 Set 对象转化为 Array 数组
          this.historyList = Array.from(set)
          
          // uni.setStorageSync()将历史记录保存在本地
          uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean(){
        this.historyList=[],
        uni.setStorageSync('kw','[]')
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query='+kw
        })
      }
    },
    //将搜索记录反转
    computed:{
      historys(){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.uni-searchbar {
  display: flex;
  flex-direction: row;
  position: relative;
  padding: 16rpx;
  background-color: #F2E8DF;
}
//吸顶及防止被覆盖
.search-box{
  position: sticky;
  top:0;
  z-index:999;
}

//搜索框内容展示区域
.sugg-list {
  padding: 0 5px;

  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;

    .goods-name {
      // 文字不允许换行（单行文本）
      white-space: nowrap;
      // 溢出部分隐藏
      overflow: hidden;
      // 文本溢出后，使用 ... 代替
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}

//搜索历史
.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;

    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
      background-color: #fff;
      color: #aaa;
    }
  }
}
</style>
